
    <!DOCTYPE html>
    <html lang="zh-CN">
    <head>
      <meta charset="UTF-8">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <title>2、Spring Boot 自动配置 - 交互式测验</title>
      <style>
        @import url('https://fonts.googleapis.com/css2?family=Noto+Sans+SC:wght@400;500;700&display=swap');
        
        body {
          font-family: 'Noto Sans SC', sans-serif;
          background-color: #f4f7f9;
          color: #333;
          display: flex;
          justify-content: center;
          align-items: center;
          min-height: 100vh;
          margin: 0;
          padding: 20px;
          box-sizing: border-box;
        }
        
        .main-wrapper {
            position: relative;
            width: 100%;
            max-width: 900px; /* Wider to accommodate buttons */
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .quiz-container {
          background-color: #ffffff;
          border-radius: 16px;
          box-shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
          width: 100%;
          max-width: 700px;
          overflow: hidden;
          z-index: 10;
        }

        .quiz-header {
          background-color: #4a90e2;
          color: white;
          padding: 20px 30px;
          text-align: center;
        }

        .quiz-header h1 {
          margin: 0;
          font-size: 24px;
          font-weight: 700;
        }
        
        .quiz-header p {
            margin: 5px 0 0;
            font-size: 14px;
            opacity: 0.9;
        }

        .quiz-body {
          padding: 30px;
        }

        .progress-bar {
            display: none; /* 隐藏进度条 */
            width: 100%;
            background-color: #e0e0e0;
            border-radius: 5px;
            height: 10px;
            margin-bottom: 20px;
        }

        #progress-indicator {
            height: 100%;
            width: 0%;
            background-color: #4caf50;
            border-radius: 5px;
            transition: width 0.3s ease;
        }

        #question-container {
          margin-bottom: 20px;
        }

        #question-text {
          font-size: 18px;
          font-weight: 500;
          line-height: 1.6;
          margin-bottom: 25px;
        }

        .options-list {
          list-style: none;
          padding: 0;
          margin: 0;
        }

        .option-item {
          background-color: #f8f9fa;
          border: 1px solid #dee2e6;
          border-radius: 8px;
          padding: 15px;
          margin-bottom: 12px;
          cursor: pointer;
          transition: background-color 0.2s ease, border-color 0.2s ease;
        }

        .option-item:hover {
          background-color: #e9ecef;
        }
        
        .option-item.selected {
            background-color: #d1e7fd;
            border-color: #4a90e2;
        }

        .quiz-footer {
          padding: 20px 30px;
          display: flex;
          justify-content: space-between; /* 将按钮分布在两侧 */
          align-items: center;
          min-height: 65px; /* Reserve space */
        }

        .nav-btn {
          background-color: #4a90e2;
          color: white;
          border: none;
          border-radius: 8px;
          padding: 10px 20px;
          font-size: 16px;
          font-weight: 500;
          cursor: pointer;
          transition: background-color 0.2s ease, transform 0.2s ease;
          box-shadow: 0 4px 12px rgba(0,0,0,0.15);
        }
        
        #next-btn {
            background-color: #28a745;
        }

        .nav-btn:hover {
          background-color: #357abd;
          transform: scale(1.05);
        }
        
        .nav-btn:disabled {
            background-color: #a0c3e8;
            cursor: not-allowed;
            opacity: 0.7;
        }

        #result-container {
            border-top: 1px solid #eee;
        }
        
        .result-box {
            border-radius: 8px;
            padding: 20px;
            margin-top: 20px;
        }
        
        .result-box.correct {
            background-color: #d4edda;
            border: 1px solid #c3e6cb;
            color: #155724;
        }

        .result-box.incorrect {
            background-color: #f8d7da;
            border: 1px solid #f5c6cb;
            color: #721c24;
        }
        
        .result-box h3 {
            margin-top: 0;
        }

        .explanation-text {
            margin-top: 15px;
            line-height: 1.7;
        }
        
        .source-text {
            font-style: italic;
            font-size: 14px;
            margin-top: 15px;
            color: #555;
        }

        
        .final-score-container {
            padding: 40px;
            text-align: center;
        }
        .final-score-container h2 {
            margin-top: 0;
            margin-bottom: 30px;
        }
        .score-summary {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-bottom: 40px;
            flex-wrap: wrap;
        }
        .score-card {
            background-color: #f8f9fa;
            border-radius: 12px;
            padding: 20px;
            width: 180px;
            box-shadow: 0 4px 12px rgba(0,0,0,0.05);
            border: 1px solid #e9ecef;
        }
        .score-card h3 {
            margin: 0 0 10px;
            font-size: 16px;
            font-weight: 500;
            color: #555;
        }
        .score-card p {
            margin: 0;
            font-size: 28px;
            font-weight: 700;
            color: #333;
        }
        .score-details table {
            width: 100%;
            font-size: 16px;
        }
        .score-details td {
            padding: 4px 0;
        }
        .score-details td:last-child {
            text-align: right;
            font-weight: 700;
        }
        .report-actions button {
            background-color: #fff;
            border: 1px solid #ccc;
            border-radius: 8px;
            padding: 12px 25px;
            font-size: 16px;
            cursor: pointer;
            margin: 0 10px;
            transition: background-color 0.2s ease, border-color 0.2s ease, transform 0.2s ease;
        }
        .report-actions button:hover {
            background-color: #f1f1f1;
            border-color: #bbb;
            transform: translateY(-2px);
        }
        .report-actions button.primary {
            background-color: #28a745;
            color: white;
            border-color: #28a745;
        }
        .report-actions button.primary:hover {
            background-color: #218838;
        }
        
        .hint-container {
            background-color: #e0f7fa;
            border: 1px solid #b2ebf2;
            border-radius: 8px;
            padding: 15px;
            margin-top: 20px;
            color: #006064;
            font-size: 15px;
            line-height: 1.6;
            display: none; /* 默认隐藏 */
        }
      </style>
    </head>
    <body>
      <div class="main-wrapper">
          <div class="quiz-container">
            <div class="quiz-header">
              <h1>2、Spring Boot 自动配置 - 交互式测验</h1>
              <p>检验你对文档内容的理解程度</p>
            </div>
            <div id="quiz-content">
                <div class="quiz-body">
                    <div class="progress-bar">
                        <div id="progress-indicator"></div>
                    </div>
                    <div id="question-container">
                      <p id="question-text"></p>
                      <ul class="options-list" id="options-list"></ul>
                    </div>
                    <div id="result-container"></div>
                    <div id="hint-container" class="hint-container"></div>
                </div>
                <div class="quiz-footer" id="quiz-footer">
                  <button id="prev-btn" class="nav-btn">上一题</button>
                  <button id="hint-btn" class="nav-btn" style="background-color: #ffc107; color: #333; box-shadow: 0 4px 12px rgba(255,193,7,0.3);">提示</button>
                  <button id="next-btn" class="nav-btn">下一题</button>
                </div>
            </div>
          </div>
      </div>

      <script>
        const quizData = [
  {
    "question": "Spring Boot的“自动配置”机制核心目标是什么？",
    "options": [
      "根据应用环境（如类路径、配置文件）自动配置所需组件，简化开发者的配置工作。",
      "强制所有开发者遵循统一的编码规范，以提高代码质量。",
      "完全替代Maven或Gradle等构建工具，实现一键打包部署。",
      "为应用程序自动生成业务逻辑代码，减少编码量。"
    ],
    "correctAnswerIndex": 0,
    "explanation": "Spring Boot自动配置的核心理念是“约定大于配置”。它会根据你项目中的依赖（例如，类路径中存在 H2 数据库的jar包）和配置，自动为你创建和配置相应的Bean（例如，一个指向H2数据库的DataSource）。这极大地简化了原本需要手动编写大量XML或Java配置的工作。",
    "source": "文档中「Spring Boot 自动配置」及「1. 自动配置的核心概念」部分",
    "hint": "文档提到，自动配置的核心理念是“自动选择合适的配置，以简化开发流程”。"
  },
  {
    "question": "在Spring Boot应用中，为什么我们通常只需要在主类上使用 `@SpringBootApplication` 注解就能启用自动配置功能？",
    "options": [
      "`@EnableAutoConfiguration` 是一个过时的注解，已被 `@SpringBootApplication` 完全取代。",
      "因为 `@SpringBootApplication` 是一个组合注解，它内部已经包含了 `@EnableAutoConfiguration`。",
      "`@SpringBootApplication` 和 `@EnableAutoConfiguration` 功能完全相同，只是别名关系。",
      "因为 `@SpringBootApplication` 会在运行时动态扫描并决定是否需要添加 `@EnableAutoConfiguration`。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "`@SpringBootApplication` 是一个便捷的“三合一”注解，它整合了三个常用注解：`@Configuration`（将该类声明为配置类）、`@EnableAutoConfiguration`（启用Spring Boot的自动配置机制）和`@ComponentScan`（在当前包及其子包下扫描组件）。因此，使用了 `@SpringBootApplication` 就无需再显式地使用 `@EnableAutoConfiguration`。",
    "source": "文档中「1. 自动配置的核心概念」下的「@EnableAutoConfiguration 与 @SpringBootApplication 的关系」部分",
    "hint": "请思考一下“组合注解”的含义，以及 `@SpringBootApplication` 包含了哪些核心注解。"
  },
  {
    "question": "如果你希望某个自动配置仅在Spring容器中*不存在*特定类型的Bean时才生效，应该使用哪个条件注解？",
    "options": [
      "`@ConditionalOnBean`",
      "`@ConditionalOnClass`",
      "`@ConditionalOnMissingBean`",
      "`@ConditionalOnProperty`"
    ],
    "correctAnswerIndex": 2,
    "explanation": "`@ConditionalOnMissingBean` 是一个非常有用的条件注解。它允许开发者提供一个默认的Bean配置，但如果用户自己定义了同类型的Bean，那么这个默认配置就不会生效，从而给予用户更高的灵活性和覆盖能力。例如，Spring Boot的 `DataSourceAutoConfiguration` 就是用它来配置默认数据源的。",
    "source": "文档中「2. Spring Boot 自动配置的实现」下的「条件注解（@Conditional 系列）」部分",
    "hint": "这个注解的字面意思可以理解为“当缺少某个Bean时条件成立”。"
  },
  {
    "question": "`AutoConfigurationImportSelector` 在Spring Boot的自动配置流程中扮演了什么关键角色？",
    "options": [
      "它负责解析 `application.properties` 文件中的所有配置项。",
      "它负责编译所有的Java配置类以提高启动速度。",
      "它负责在应用启动时，根据条件选择并导入所有符合条件的自动配置类。",
      "它是一个Web服务器，用于处理HTTP请求。"
    ],
    "correctAnswerIndex": 2,
    "explanation": "`AutoConfigurationImportSelector` 是实现自动配置的“大脑”。当 `@EnableAutoConfiguration` 被触发时，Spring会调用这个类的 `selectImports` 方法。该方法会去扫描所有jar包下的 `META-INF/spring.factories` 文件（在Spring Boot 2.7+中是 `META-INF/spring/org.springframework.boot.autoconfigure.AutoConfiguration.imports` 文件），找出其中声明的所有自动配置类，并根据各种 `@Conditional` 注解判断哪些应该被加载到Spring容器中。",
    "source": "文档中「2. Spring Boot 自动配置的实现」下的「AutoConfigurationImportSelector」部分",
    "hint": "它的类名中包含了“ImportSelector”（导入选择器），这揭示了它的主要职责。"
  },
  {
    "question": "根据文档中的 `DataSourceAutoConfiguration` 示例，在什么条件下Spring Boot会默认配置一个Hikari数据源？",
    "options": [
      "当类路径中存在 `DataSource.class` 且Spring容器中缺少 `DataSource` 类型的Bean时。",
      "只要类路径中存在 `DataSource.class` 就会自动配置。",
      "只有在 `application.properties` 文件中明确指定 `spring.datasource.type=hikari` 时。",
      "当容器中已经存在一个自定义的 `DataSource` Bean时。"
    ],
    "correctAnswerIndex": 0,
    "explanation": "文档中的示例代码展示了两个关键的条件注解：`@ConditionalOnClass(DataSource.class)` 确保只有在引入了数据库驱动等相关依赖后（类路径中能找到 `DataSource` 接口），这个配置才可能生效。`@ConditionalOnMissingBean` 则确保如果用户已经自己配置了一个 `DataSource` Bean，Spring Boot就不会再创建默认的Hikari数据源，避免了冲突。",
    "source": "文档中「3. Spring Boot 常见的自动配置类」下的「数据源自动配置」部分",
    "hint": "仔细观察示例代码中的两个注解：`@ConditionalOnClass` 和 `@ConditionalOnMissingBean`，它们共同决定了配置是否生效。"
  },
  {
    "question": "当你想要自定义一个自动配置类，使其仅在配置文件中某个特定属性值为`true`时生效，应该优先使用哪个注解组合？",
    "options": [
      "`@Configuration` 和 `@Service`",
      "`@Configuration` 和 `@ConditionalOnProperty(name = \"...\", havingValue = \"true\")`",
      "`@Component` 和 `@ConditionalOnClass`",
      "`@Configuration` 和 `@Autowired`"
    ],
    "correctAnswerIndex": 1,
    "explanation": "要创建一个自定义自动配置类，首先需要 `@Configuration` 将其标记为配置类。为了根据配置文件中的属性来控制其加载，`@ConditionalOnProperty` 是最直接和正确的选择。`name` 属性指定了配置项的名称，而 `havingValue` 属性则用于匹配该配置项的具体值。",
    "source": "文档中「4. 如何自定义自动配置」部分",
    "hint": "文档中的自定义配置示例明确展示了如何使用一个条件注解来检查配置文件中的属性值。"
  },
  {
    "question": "根据文档中对Web服务器自动配置的描述，`WebServerFactoryAutoConfiguration` 配置一个嵌入式Tomcat服务器的前提条件是什么？",
    "options": [
      "类路径中必须存在 `Servlet.class`，并且容器中已经存在一个 `WebServerFactory` 类型的Bean。",
      "类路径中必须存在 `Servlet.class`，并且容器中没有 `WebServerFactory` 类型的Bean。",
      "用户的 `pom.xml` 中必须明确排除了Jetty和Undertow依赖。",
      "配置文件中必须设置 `server.port=8080`。"
    ],
    "correctAnswerIndex": 1,
    "explanation": "文档中的示例代码清晰地展示了两个条件：`@ConditionalOnClass(Servlet.class)` 判断当前是否为Web环境（通过检查是否存在Servlet API）；`@ConditionalOnMissingBean(WebServerFactory.class)` 判断容器中是否已经有其他地方配置了Web服务器工厂。只有当这两个条件同时满足时，这个自动配置才会生效，创建一个默认的Tomcat服务器。",
    "source": "文档中「3. Spring Boot 常见的自动配置类」下的「Web 服务器自动配置」部分",
    "hint": "Web服务器配置的示例代码中包含了 `@ConditionalOnClass` 和 `@ConditionalOnMissingBean` 两个注解，请关注它们的具体作用。"
  }
];
        console.log("Quiz Data:", JSON.parse(JSON.stringify(quizData))); // 添加这行用于调试，以可展开的JSON格式输出
        
        let currentQuestionIndex = 0;
        let score = 0;
        // 存储每个问题的回答状态
        const userAnswers = new Array(quizData.length).fill(null); 

        const questionTextEl = document.getElementById('question-text');
        const optionsListEl = document.getElementById('options-list');
        const resultContainerEl = document.getElementById('result-container');
        const quizContentEl = document.getElementById('quiz-content');
        const progressIndicatorEl = document.getElementById('progress-indicator');
        const prevBtn = document.getElementById('prev-btn');
        const nextBtn = document.getElementById('next-btn');
        const hintBtn = document.getElementById('hint-btn');
        const hintContainerEl = document.getElementById('hint-container');

        function loadQuestion() {
          resultContainerEl.innerHTML = '';
          optionsListEl.innerHTML = '';
          hintContainerEl.style.display = 'none'; // 隐藏提示
          
          if (currentQuestionIndex >= quizData.length) {
            showFinalScore();
            return;
          }

          updateProgress();

          const currentQuestion = quizData[currentQuestionIndex];
          questionTextEl.textContent = `(${currentQuestionIndex + 1}/${quizData.length}) ${currentQuestion.question}`;
          
          currentQuestion.options.forEach((optionText, index) => {
            const li = document.createElement('li');
            li.className = 'option-item';
            li.textContent = optionText;
            li.dataset.index = index; // Store index in a data attribute
            // 如果这道题已经回答过，恢复状态
            if (userAnswers[currentQuestionIndex] !== null) {
                if (index === userAnswers[currentQuestionIndex]) {
                    li.classList.add('selected');
                }
            }
            optionsListEl.appendChild(li);
          });

          // 如果已经回答过，直接显示结果
          if (userAnswers[currentQuestionIndex] !== null) {
              const isCorrect = userAnswers[currentQuestionIndex] === currentQuestion.correctAnswerIndex;
              showResult(isCorrect, currentQuestion);
          }
          
          updateNavigationButtons();
          updateProgress();
        }

        function selectOption(optionIndex) {
            userAnswers[currentQuestionIndex] = optionIndex;
            const currentQuestion = quizData[currentQuestionIndex];
            const isCorrect = optionIndex === currentQuestion.correctAnswerIndex;

            // 重新计算分数
            score = userAnswers.reduce((acc, answer, index) => {
                return answer === quizData[index].correctAnswerIndex ? acc + 1 : acc;
            }, 0);

            showResult(isCorrect, currentQuestion);
            updateNavigationButtons();
        }
        
        function updateProgress() {
            const answeredQuestions = userAnswers.filter(answer => answer !== null).length;
            const progressPercentage = (answeredQuestions / quizData.length) * 100;
            progressIndicatorEl.style.width = `${progressPercentage}%`;
        }
        
        function updateNavigationButtons() {
            prevBtn.style.display = 'block';
            nextBtn.style.display = 'block';
            hintBtn.style.display = 'block'; // 显示提示按钮

            prevBtn.disabled = currentQuestionIndex === 0;
            nextBtn.disabled = false; // 最后一题时，下一题按钮不禁用，而是用于显示报告
            nextBtn.textContent = (currentQuestionIndex === quizData.length - 1) ? '查看报告' : '下一题';
            
            // 如果当前问题没有提示，则禁用提示按钮并隐藏提示内容
            if (!quizData[currentQuestionIndex].hint) {
                hintBtn.disabled = true;
                hintContainerEl.style.display = 'none';
                hintContainerEl.textContent = ''; // 清除旧的提示内容
            } else {
                hintBtn.disabled = false;
            }
        }

        function showResult(isCorrect, questionData) {
            resultContainerEl.innerHTML = ''; // 清空之前的结果
            const resultBox = document.createElement('div');
            resultBox.className = `result-box ${isCorrect ? 'correct' : 'incorrect'}`;
            
            let html = `<h3>${isCorrect ? '回答正确！' : '回答错误'}</h3>`;
            if (!isCorrect) {
                html += `<p><strong>正确答案是：</strong> ${questionData.options[questionData.correctAnswerIndex]}</p>`;
            }
            html += `<div class="explanation-text">${questionData.explanation}</div>`;
            html += `<div class="source-text">来源: ${questionData.source}</div>`;
            
            resultBox.innerHTML = html;
            resultContainerEl.appendChild(resultBox);

            // 禁用所有选项的点击事件，并高亮正确/错误答案
            Array.from(optionsListEl.children).forEach((child, index) => {
                child.style.pointerEvents = 'none';
                // 高亮正确答案
                if (index === questionData.correctAnswerIndex) {
                    child.classList.add('correct'); // 需要添加CSS样式
                    child.style.backgroundColor = '#d4edda';
                    child.style.borderColor = '#c3e6cb';
                }
                // 如果选错了，高亮错误选项
                if (!isCorrect && index === userAnswers[currentQuestionIndex]) {
                    child.classList.add('incorrect'); // 需要添加CSS样式
                    child.style.backgroundColor = '#f8d7da';
                    child.style.borderColor = '#f5c6cb';
                }
            });
        }

        function goToNextQuestion() {
            if (currentQuestionIndex < quizData.length - 1) {
                currentQuestionIndex++;
                loadQuestion();
            } else {
                showFinalScore();
            }
        }

        function goToPreviousQuestion() {
            if (currentQuestionIndex > 0) {
                currentQuestionIndex--;
                loadQuestion();
            }
        }
        
        function showHint() {
            const currentQuestion = quizData[currentQuestionIndex];
            if (currentQuestion.hint) {
                hintContainerEl.textContent = currentQuestion.hint;
                hintContainerEl.style.display = 'block';
            } else {
                hintContainerEl.style.display = 'none';
            }
        }

        function showFinalScore() {
            document.querySelector('.quiz-body').style.display = 'none';
            document.getElementById('quiz-footer').style.display = 'none';

            const correctCount = score;
            const totalQuestions = quizData.length;
            const answeredCount = userAnswers.filter(a => a !== null).length;
            const wrongCount = answeredCount - correctCount;
            const skippedCount = totalQuestions - answeredCount;
            const accuracy = totalQuestions > 0 ? Math.round((correctCount / totalQuestions) * 100) : 0;
            const errorRate = totalQuestions > 0 ? Math.round((wrongCount / totalQuestions) * 100) : 0;

            const finalScoreHtml =
                '<div class="final-score-container">' +
                '<h2>答题报告</h2>' +
                '<div class="score-summary">' +
                '<div class="score-card">' +
                '<h3>得分</h3>' +
                '<p>' + correctCount + ' / ' + totalQuestions + '</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>正确率</h3>' +
                '<p>' + accuracy + '%</p>' +
                '</div>' +
                '<div class="score-card">' +
                '<h3>错误率</h3>' +
                '<p>' + errorRate + '%</p>' +
                '</div>' +
                '<div class="score-card score-details">' +
                '<table>' +
                '<tr><td>正确</td><td>' + correctCount + '</td></tr>' +
                '<tr><td>错误</td><td>' + wrongCount + '</td></tr>' +
                '<tr><td>未答</td><td>' + skippedCount + '</td></tr>' +
                '</table>' +
                '</div>' +
                '</div>' +
                '<div class="report-actions">' +
                '<button id="review-btn">回顾测验</button>' +
                '<button class="primary" onclick="location.reload()">再试一次</button>' +
                '</div>' +
                '</div>';

            let reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }
            quizContentEl.insertAdjacentHTML('beforeend', finalScoreHtml);
            document.getElementById('review-btn').addEventListener('click', reviewQuiz);
        }

        function reviewQuiz() {
            const reportEl = document.querySelector('.final-score-container');
            if (reportEl) {
                reportEl.remove();
            }

            document.querySelector('.quiz-body').style.display = 'block';
            document.getElementById('quiz-footer').style.display = 'flex';
            
            currentQuestionIndex = 0;
            loadQuestion();
            updateNavigationButtons(); // Ensure nav buttons are correctly displayed
        }

        // Event Delegation for options
        optionsListEl.addEventListener('click', (event) => {
            if (event.target && event.target.matches('li.option-item')) {
                // Check if the question has already been answered
                if (userAnswers[currentQuestionIndex] === null) {
                    const selectedIndex = parseInt(event.target.dataset.index, 10);
                    selectOption(selectedIndex);
                }
            }
        });

        prevBtn.addEventListener('click', goToPreviousQuestion);
        nextBtn.addEventListener('click', goToNextQuestion);
        hintBtn.addEventListener('click', showHint);
        
        // 初始加载
        loadQuestion();
      </script>
    </body>
    </html>
  